He didn't notice. Will it do him any harm? In my defence he keeps insisting on putting his toothbrush away in the cupboard, when we keep the rest of the toothbrushes/paste on the side. I reached into the cupboard for his toothbrush and just automatically picked up the tube beside it. It was only as he was brushing I realised it was the stuff for DPuppy.
And yes I know he should probably be going to bed earlier but he co sleeps and won't go to bed until I do unless the stars are aligned and the angels are singing
Will it have harmed him? It doesn't appear to have any different ingredients to normal toothpaste but it's not made for humans.